110.26 -- Spaces About Electrical
Who Cut My
NFPA Announces Corrections to 2005
Who Do You
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The designations "National Electrical Code” and “NEC” refer to the
National Electrical Code®, which is a registered trademark of the
National Fire Protection Association.
Top 2005 Code Changes
About Electrical Equipment
By Mike Holt
The requirement that equipment rated 1,200A or more had
to be more than 6 feet wide before an entrance was required at each end
of the working space was removed.
What the Code says:
(C) Entrance to
(2) Large Equipment. For equipment rated 1,200A or more
more than 6 ft wide, an entrance measuring not less than 24
wide and 61/2 ft high is required at each end of
the working space. Where the entrance to the working space has a door,
the door must open out and be equipped with panic hardware or other
devices that open under simple pressure. (Click here
for an illustration of the change.)
Behind the change: The argument for the change was that the
size of the arc blast is directly related to the ampere rating of the
equipment, not the physical width of the equipment.
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Who Cut My Wires?
When I happened to stop by a newly remodeled grocery
store where we had completed the temperature controls the previous
I was met instantly by a hopping-mad manager. Apparently the place had
been cold for several days. A quick measurement of the resistance of
thermistor sensor at the panel showed it was an open circuit. The store
was so large that it had four far-flung temperature sensors in a
series/parallel circuit, which is equal to one, but somewhere out there
a wire had come loose and opened the loop. I quickly wired back in one
sensor in the center of the store to get the heating system going. I
then opened up several ceiling tiles and found four of our wires had
been cut off about 10 feet from one of the sensors. Apparently the
people who wired the public address system had run out of wire to
complete their work so they cut our wires and used quite a long section
of them to connect some speakers. The public address contractor
believe that his people would do such a thing, but he came out to
replace the work when I mentioned lawsuits and backcharges.
Send your 200-word story to us and it may
appear in a future issue of CodeWatch. Authors of stories chosen will
Cool Electronic Cabinets
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electrical controls. Thermostat control minimizes air usage. Maintains
the NEMA 4, 4X (stainless steel) and 12 rating of the enclosure. Web
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What's Wrong Here?
By Joe Tedesco
How does this
installation violate the NEC?
Hint: This EMT and conduit body is installed in a wet
By Mike Holt
Q. Does the Code permit a circuit breaker to be
See the answer.
By Steven Owen
In a newly designed multi-family dwelling unit
(208/120V, 3-phase, 4-wire system) the load on the service
grounded "neutral" conductor is calculated to be 475A. What is the
demand load, if any, on the grounded "neutral" conductor of this
Visit EC&M's Web
for the answer and explanation.
Are you paying too much for enclosed
Cerus builds quality HVAC and industrial starters that boost your
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Code News Updates
Corrections to 2005 NEC
For those of you who were first in line to buy the
latest Code book, it's time to get out your red pen and make some
homemade revisions. NFPA just released a list of errata
that apply to the first edition of the 2005 NEC. The full list of
corrections can be found at the
NFPA site. Although many of the errors involve transposed numbers
and letters, some could have a significant effect on how Code
requirements are interpreted.
If you're unsure whether you have a first edition Code book, check
the line of numbers that appear at the bottom of the inside front
If the last number is "1," you have a first edition.
The National Electrical Code Internet Connection, the No. 1
rated Code Web site in the world, offers the following FREE products:
Books, Code Quiz, DVDs, Graphics for PowerPoint, Newsletter, Online
Training, Posters, Simulated Exams, Software, Video clips, and Videos
Visit www.NECcode.com and stay
current with important industry issues.
Who Do You Call?
As the NFPA's recently published errata proves, even
NEC makes mistakes sometimes. When you encounter something in the Code
that doesn't quite make sense, whom do you go to for clarification?
Visit EC&M's Web site to
You may want to tell your lazy neighbor to take his Christmas lights
down every Spring, but the majority of CodeWatch readers think that's
the electrical inspector's responsibility. Last issue's poll
received an usually high number of responses, and 56% of you think it's
up to the inspector to inform homeowners of the NEC's 90-day
restriction. A CodeWatch reader, Kid Stevens, suggested a different
approach: "Send a letter or a code notification to the Local Power
Utilities to include a message to the local users in the bill. This
message will apprise the end users of Code changes that effect them
directly." Food for thought.
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